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d99cefbad1
Summary: If both vector args to vselect are concat_vectors and the condition is constant and picks half a vector from each argument, convert the vselect into a concat_vectors. Added a test. The ConvertSelectToConcatVector is assuming it doesn't get vselects with arguments of, for example, <undef, undef, true, true>. Those get taken care of in the checks above its call. Reviewers: nadav, delena, grosbach, hfinkel Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D3916 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209929 91177308-0d34-0410-b5e6-96231b3b80d8